oWin:SetCoors( <oRect>) -> <nil>

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 PARAMETER:

  <oRect>      Is a TRect Object  with the new coordinate information 
               for the window. This informations are expected to be pixel 
               based


 DESCRIPTION:
  
  ::SetCoors() can be used to change the coordinates of the window. 
  If the window is the application's main window the coordinates are 
  interpreted as relative to the top-left of the screen; if its a client
  window the coordinates are relative to the top-left of the parent window.

  After moving the window to the new position, ::setCoors() updates the
  ::nTop to ::nRight instance vars.